Network · AS17638

AS17638 ASN for TIANJIN Provincial Net of CT

AS17638 (ASN for TIANJIN Provincial Net of CT) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Network check ASN

AS17638

OwnerASN for TIANJIN Provincial Net of CT
KindInternet service provider
Servers, not peopleno
IPv4 addresses602,112
IPv4 ranges122
IPv6 ranges11

Risk score0

Nothing suspicious found.

Largest IPv4 ranges

42.80.0.0/16
36.106.0.0/16
180.212.0.0/16
106.47.0.0/16
221.239.0.0/17
221.238.128.0/17
42.122.64.0/18
42.122.128.0/18
180.213.128.0/18
123.151.192.0/18
123.150.0.0/18
42.122.224.0/19

Ranges and owner from DB-IP (CC BY 4.0), updated 2026-10-21.

Check an IP address →

Detect it in code

Spot AS17638 traffic at signup.

Send the visitor's IP. The response includes the ASN, the owner and flags.hosting.

curl https://veqen-app.com/v1/ip/check \
  -H "Authorization: Bearer $VEQEN_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{"ip": "203.0.113.7"}'

import os, requests

r = requests.post(
    "https://veqen-app.com/v1/ip/check",
    headers={"Authorization": f"Bearer {os.environ['VEQEN_API_KEY']}"},
    json={"ip": "203.0.113.7"},
    timeout=10,
)
result = r.json()
print(result["risk"]["verdict"], result["risk"]["reasons"])

const res = await fetch("https://veqen-app.com/v1/ip/check", {
  method: "POST",
  headers: {
    Authorization: `Bearer ${process.env.VEQEN_API_KEY}`,
    "Content-Type": "application/json",
  },
  body: JSON.stringify({"ip": "203.0.113.7"}),
});
const result = await res.json();
console.log(result.risk.verdict, result.risk.reasons);

Questions

About AS17638

Is AS17638 a datacenter or VPN network?

AS17638 (ASN for TIANJIN Provincial Net of CT) looks like an internet service provider, so its addresses are mostly real home, business or mobile connections.

Who owns AS17638?

AS17638 is registered to ASN for TIANJIN Provincial Net of CT. It announces about 602,112 IPv4 addresses.

How do I detect traffic from AS17638?

Call the Veqen IP check with the visitor's address. The response includes the ASN, the owner and whether the network is a datacenter, VPN network, relay or ISP.